Connection of electric conductors



June so,- 1925. v ,7 1543.!

E. GINDRE I COINBCTION 01" ELECTRIC CONDUCTORS Fil ed. April 14, 1924I7. lmdr d m Patented June 30, 1925.

EUGENE ommm, ormvatnorsaraaaar, Eamon, ASSIGNOR rosocm'm 'ANONYME LACARBONE, OF LEVAILLDIS-FERRET, FRANCE. I

CONNECTION or ELECTRIC CONDUCTORS.

Application filed April 14, 1924. Serial No. 706,552;

To all whom it may concern:.

Be it known that I, EUGENE G'INDRE, 12 and 33 Rue de Lorraine,Levallois-Perret, Seine. Francehave invented Improvements in or Relatingto the Connection of Electric Conductors,of which the following is afull, clear, and exact description.

The present invention has reference to the connection of electricconductors and more particularly to the fixing of metallic conductors inmembers formed of a material such as carbon or graphitio composition.

The object of the invention is to provide l a perfect electric contactand an extremely strong or solid attachment, irrespective of the heat orvibration to which the connection may be subjected; moreovertheconnection is simple, rapid and economical in its use.

The present invention briefly stated'consists in forming in oneconductor a socket having at its base a peripheral cavity, inserting inthe socket a metallic capsule, .part of which is pressed into saidcavity, and fixing the end of the other conductor within the capsule.

With a view to giving a clear idea of the subject matter of thisinvention one method.

of carrying out the invention will now be described with reference-tothe accompanying drawing, in which c Figure 1 shows in section theintroduction of the capsule into the socket in a carbon brush forexample. c

Figure 2 represents the in the brush.

Figure 3 shows the completed connection partly in section and partly inelevation.

As shown in the drawings, in the brush a there is formed a socket b andin the base of this latter there is a circular peripheral cavity 0. Intothis socket there is introduced a friction tight capsule (l preferablyof red copper. Then into this capsule there is introduced a mandril chaving a shoulder or abutment f which bears upon the edge of the openend of the capsule of (Figure 1).

This mandril is lowered as shown by the capsule mounted I arrow inFigure 1, and in its downward movement exert-s, by means of the shoulderf, a compressive action upon the upper edge of the capsule, which isthus pushed down to the bottom of the socket b and its lower part isforced into the peripheral circular cavity 0 Figure 2. This forcing downof the metal thus causes an intimate and firm contactbetween thebrushand the capsule d.

The metal cable 7 is afterwards engaged in the capsule d thus mounted inthe brush a and is fixed therein either by forming a bezel round a partof the capsule which may protrude from the socket as is shown in Figure3 or by soldering or in some other suitable way.

With a view to ensuring,-still more completely, the electric contact ofthe capsule with the brush "the well of the socket b may he copperedor.,a conductive metallic powder may be introduced into this hole beforethe capsule d is embedded therein.

The connecting arrangement of this invention has the following leadingadvantages:

I 1. From the electrical point of view the end of the cable and thecapsule, forced into the substance of the brush, constitute a connectionthe loss in contact of which is reduced to a minimum. It is furthermoreprotected against all external influences and is not exposed todeterioration byheating of the brush.

2. From the mechanical point of View the connection is simple, quick andeconomical to effect. It is very solid and is perfectly immune from theaction of heat and vibration to which the connection may be subjected.It is furthermore to be remarked that the mounting of the cable may bemade on all faces or on all sides of the brush as it is only necessaryto cut a socket in the latter for each connection; in addition to thisthe clamping of the capsule in the brush being effected in the cent-reof the brush its solidity is not impaired.

The end of the capsule projecting from the face of the brush may beutilized for carrying protective sleeves or other devices of conductingor insulating material.

The manner of forming a connection constituting the subject matter ofthe present invention may be adapted to various applications and form,the dimensions and the structural details of the parts constituting theconnecting device may be modified according to its particularapplication.

Claims 1. A method for attaching electric conductors, and intended morespecifically for attaching electric cables to carbon brushes,

conductor is to be attached, providing at the base of said blind openinga circular peripheral cavity, engaging in said blind opening a cap theheight of which is greater than the depth of the latter, so that saidcap will project from the blind opening, forcing said lower part of thecap into the circular peripheral cavity provided at the base of theblind opening, engaging in said cap a conductor the diameter of which issubstantially equal to the internal diameter of the cap, and atlixingthe electric conductor directly in this latter.

2. A method for attaching electric conductors, and intended morespecifically for attaching electric cables to carbon brushes. saidmethod consisting in providing a blind opening in the member to whichthe electric conductor is to be attached, providing at the base of saidblind opening a circular peripheral cavity, engaging in said blind oening a cap the height of which is greater than the depth of the latter,so that said cap will project from the blind opening forcing said lowerpart of the cap into the circular peripheral cat'ity provided at thebase of the blind opening, engaging in sale cap a conductor the diameterof which is substantially equal to the internal (ll2l1116t0" of the capand fastening to the conductor the end of the cap projecting from theblind opening.

3. A device for connecting electric conductors and particularly forfixing a metallic conductor to a member formed of a material such ascarbon or a graphite composition, comprising: a socket provided in themember on which must be secured the electric conductor and having at itsbase a circular peripheral cavity,a capsule inserted in this socket insuch conditions that its peripheral portion is pressed into thiscircular peripheral cavity of the socket and that its open end projectsoutside the said socket,ineans for securing in this capsule the end ofthe conductor to be connected.

The foregoing specification of my 1111- provements in or relating to theconnection of electric conductors, signed by me this 3d day of April1924.

EUGENE GINDRE.

